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<a href="fir__float_8cl.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment"> * This confidential and proprietary software may be used only as</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment"> * authorised by a licensing agreement from ARM Limited</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"> *    (C) COPYRIGHT 2013 ARM Limited</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"> *        ALL RIGHTS RESERVED</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * The entire notice above must be reproduced on all authorised</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * copies and copies may only be made to the extent permitted</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * by a licensing agreement from ARM Limited.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;</div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment">/* FW_SCALE = 1 / 256. */</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a054b6a28d5e2412083493f2d43ba7210">   12</a></span>&#160;<span class="preprocessor">#define FW_SCALE 0.00390625f</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#ad4c882aae33d779624d02d0d88bae565">   13</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_UL (30.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#ada3c939d265394a260f3bcf800c16d01">   14</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_UM (5.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a86163952d447939d88b2ab454efd091a">   15</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_UR (6.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#ac7935f8e7004ebaa9c1cb835ebb7576e">   16</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_CL (19.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a5d47ed70581c7a693231547336cb00aa">   17</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_CM (30.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a1a85069496abcfdd6757ca710c185c19">   18</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_CR (9.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a436f4eeb8849d5ddf8c0fcba12a847b6">   19</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_BL (15.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#ad946956a7dc74b2b24008dfbcf6cc56f">   20</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_BM (5.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#ac2d22f5bd6ac4522b7fe5cbc1b32c566">   21</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define FW_BR (40.0f * FW_SCALE)</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="code" href="fir__float_8cl.html#a1bacdbaeb8f7bf3c8ac34929a28e689c">   29</a></span>&#160;__kernel <span class="keywordtype">void</span> <a class="code" href="fir__float_8cl.html#a1bacdbaeb8f7bf3c8ac34929a28e689c" title="FIR filter kernel function.">fir_float</a>(__global <span class="keyword">const</span> <span class="keywordtype">float</span>* restrict input,</div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;                        __global <span class="keywordtype">float</span>* restrict output,</div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;                        <span class="keyword">const</span> <span class="keywordtype">int</span> width)</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;{</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="comment">/* [Kernel size] */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment">     * Each kernel calculates 4 output pixels in the same row (hence the &#39;* 4&#39;).</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">     * column is in the range [0, width] in steps of 4.</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment">     * row is in the range [0, height].</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> column = get_global_id(0) * 4;</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> row = get_global_id(1);</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    <span class="comment">/* Offset calculates the position in the linear data for the row and the column. */</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;    <span class="keyword">const</span> <span class="keywordtype">int</span> offset = row * width + column;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="comment">/* [Kernel size] */</span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    <span class="comment">/* Accumulator array of 4 floats. */</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    float4 accumulator = (float4)0.0f;</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment">     * As mentioned before the kernel works on a 6x3 window.</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment">     * e.g. If the data in the input array is as follows:</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment">     * [0  1  2  3  4  5 ]</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="comment">     * [6  7  8  9  10 11]</span></div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment">     * [12 13 14 15 16 17]</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment">     * We load overlapping data from the first row into 3 vectors:</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">     * data0 = [0 1 2 3]</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment">     * data1 = [1 2 3 4]</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment">     * data2 = [2 3 4 5]</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">     * Which means the first result of accumulator will be equal to:</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment">     * accumulator.s0 = data0.s0 * FW_UL + data1.s0 * FW_UM + data2.s0 * FW_UR</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment">     *</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment">     * The same is done for the second and third row, which makes acc.s0 the sum of 0, 1, 2, 6, 7, 8, 12, 13 and 14</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment">     * multiplied by the corresponding coefficients.</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="comment">     * If this indices are compared with the input array, we can see the 3x3 window of the FIR filter.</span></div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    <span class="comment">/* [Load first row] */</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment">     * Access the first row in the 6x3 window to apply FW_U coefficients.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment">     * data1 can be constructed from the other vectors without doing an additional load.</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    float4 data0 = vload4(0, input + offset);</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    float4 data2 = vload4(0, input + offset + 2);</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    float4 data1 = (float4)(data0.s12, data2.s12);</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    <span class="comment">/* [Load first row] */</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;    <span class="comment">/* [Filter first row] */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    accumulator += data0 * <a class="code" href="fir__float_8cl.html#ad4c882aae33d779624d02d0d88bae565">FW_UL</a>;</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    accumulator += data1 * <a class="code" href="fir__float_8cl.html#ada3c939d265394a260f3bcf800c16d01">FW_UM</a>;</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    accumulator += data2 * <a class="code" href="fir__float_8cl.html#a86163952d447939d88b2ab454efd091a">FW_UR</a>;</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;    <span class="comment">/* [Filter first row] */</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    <span class="comment">/* [Load and filter second and third row] */</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    <span class="comment">/* Access the second row in the 6x3 window and repeat the process, but with FW_C coefficients. */</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;    data0 = vload4(0, input + offset + width);</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    data2 = vload4(0, input + offset + width + 2);</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    data1 = (float4)(data0.s12, data2.s12);</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;    accumulator += data0 * <a class="code" href="fir__float_8cl.html#ac7935f8e7004ebaa9c1cb835ebb7576e">FW_CL</a>;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    accumulator += data1 * <a class="code" href="fir__float_8cl.html#a5d47ed70581c7a693231547336cb00aa">FW_CM</a>;</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    accumulator += data2 * <a class="code" href="fir__float_8cl.html#a1a85069496abcfdd6757ca710c185c19">FW_CR</a>;</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;    <span class="comment">/* Access the third row in the 6x3 window and repeat the process, but with FW_B coefficients. */</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    data0 = vload4(0, input + offset + width * 2);</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    data2 = vload4(0, input + offset + width * 2 + 2);</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    data1 = (float4)(data0.s12, data2.s12);</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    accumulator += data0 * <a class="code" href="fir__float_8cl.html#a436f4eeb8849d5ddf8c0fcba12a847b6">FW_BL</a>;</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    accumulator += data1 * <a class="code" href="fir__float_8cl.html#ad946956a7dc74b2b24008dfbcf6cc56f">FW_BM</a>;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    accumulator += data2 * <a class="code" href="fir__float_8cl.html#ac2d22f5bd6ac4522b7fe5cbc1b32c566">FW_BR</a>;</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;    <span class="comment">/* [Load and filter second and third row] */</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    <span class="comment">/* [Store] */</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    <span class="comment">/* Store the accumulator. */</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;    vstore4(accumulator, 0, output + offset);</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    <span class="comment">/* [Store] */</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;}</div>
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